Study on Carbothermal Reduction Process of Manganese Ore in Microwave Field

LIU Jian, LIU Jianhua, WU Bowei, SHEN Shaobo, YUAN Cuohua, PENG Lingzhi


Carbon thermal reduction reactions of manganese ore powder by microwave heating and conventional heating were investigated. The effects of temperature, particle size and carbon-oxygen ratio on the reduction rates by microwave heating were studied by thermogravimetric analyzer.  Afterwards, the dynamic equation of the carbothermal reduction process was obtained by fitting regression, and the rate-increasing factor Q which characterized the rate increase of microwave heating with respect to conventional heating was obtained. The results showed that the material heating rate augmented with the increase of carbon-oxygen ratio, and the heating rate was performed rapidly at the initial stage and then gradually decreased by microwave heating. The increase of both temperature and carbon-oxygen ratio could accelerate the reaction rate. The reaction rate was also significantly increased with the reduction of ore particle diameter till 150 mesh. Moreover, the weight loss of reduction reaction by microwave heating was much larger than that by conventional heating under the same temperature and heat preservation time. It indicated that microwave heating performed evident effect on speeding up the reaction rate at the low temperature and late stage.



Keywords: microwave heating,  conventional heating,  weight loss rate,  carbothermal reduction,  rate-increase factor

Full Text:



LIN Wangming. Ferroalloy smelting[M]. Beijing: Chemical Industry Press, 2014:1 — 5.(In Chinese)

LI Xiaoming. Overview of ferroalloy production [М]. Beijing: Metallurgical Industry Press.2014:1 — 6.(In Chinese)

DAI Wei,SHU Li. Process technology of ferroalloy production [М].Beijing:Metallurgical Industry Press,2015:1—8.(In Chinese)

HUA Yixin. YAO Gang. XU Yangliang. et al. Study on thermal decomposition of pyrolusite by DTA-TG[J].Joumal of Kunming University of Science and Technology. 1998.23(3): 85 —87.(In Chinese)

JIANG Guochang.XU Kuangdi. XU Jianlun. Mechanism of reduction of carbon bearing Mn-ore lump in solid state [J]. Journal of Iron and Steel Research International. 1991.3(3): 1 — 8.(In Chinese)

JIANG Guochang. XU Kuangdi. XU Jianlun. et al. Stage response characteristics of reduction of carbon bearing Mn-orelump in solid state[J]. Journal of Shanghai University of Technology, 1990 A1 (3): 261 -267. (In Chinese)

ZHU Yuru. DING Weizhong. XU al. Phase change and precipitation of prereduction of сагbon bearing Mn-ore lump in solid state[J]. Journal of Shanghai University of Technology. 1989.10(6);531 —537.(In Chinese)

MENDELOVICI E. Mcchanochemical transformation of pyro-lusite via manganese reduction. [J]. Journal of Materials Science Utters. 1993.12(5) :314—317.

BERG К L, OLSEN S E. Kinetics of manganese ore reduction by carbon monoxide [J]. Metallurgical and Materials Transactions B.2000.31(3) :477—490.

LIU Jian. LIU Jianhua. YUAN Guohua. et al. The study of microwave heating characteristics of raw matenals for the producing fer-romanganese [J]. Mining and Metallurgical Engineering. 2015, 35 (3): 91-95. (In Chinese)

STANDISH N. WORNER H. Microwave application in the reduction of metal oxides with carbon [J]. Journal of Microwave Power and Electromagnetic Energy. 1990.25(3): 177—180.

STANDISH N. HUANG W.Microwave application in carbothermic of ironores[J].ISIJ International. 1991.31(3):241 —245.


  • There are currently no refbacks.